Fix typo in perlebcdic.pod

Author: pjcj

pod/perlebcdic.pod

@@ -1581,7 +1581,7 @@ characters then apply:
 then C<sort()>.  If you have a choice, it's better to lowercase things
 to avoid the problems of the two Latin-1 characters whose uppercase is
 outside Latin-1: "E<yuml>" (small C<y WITH DIAERESIS>) and "E<micro>"
-(C<MICRO SIGN>).  If you do need to upppercase, you can; with a
+(C<MICRO SIGN>).  If you do need to uppercase, you can; with a
 Unicode-enabled Perl, do:
 
     tr/ÿ/\x{178}/;